CN108240234B - A kind of Along Railway underlies coal mine gob Grouting method - Google Patents
A kind of Along Railway underlies coal mine gob Grouting method Download PDFInfo
- Publication number
- CN108240234B CN108240234B CN201711499954.1A CN201711499954A CN108240234B CN 108240234 B CN108240234 B CN 108240234B CN 201711499954 A CN201711499954 A CN 201711499954A CN 108240234 B CN108240234 B CN 108240234B
- Authority
- CN
- China
- Prior art keywords
- goaf
- grouting
- hole
- slip casting
- drilling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 64
- 239000003245 coal Substances 0.000 title claims abstract description 31
- 239000002002 slurry Substances 0.000 claims abstract description 74
- 238000005553 drilling Methods 0.000 claims abstract description 64
- 238000010276 construction Methods 0.000 claims abstract description 34
- 239000011435 rock Substances 0.000 claims abstract description 32
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 18
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 9
- 238000000151 deposition Methods 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000007569 slipcasting Methods 0.000 claims description 101
- 238000013461 design Methods 0.000 claims description 27
- 239000004568 cement Substances 0.000 claims description 26
- 238000011049 filling Methods 0.000 claims description 26
- 239000011440 grout Substances 0.000 claims description 24
- 230000003068 static effect Effects 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000011084 recovery Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 13
- 238000007596 consolidation process Methods 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 10
- 241000256135 Chironomus thummi Species 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010881 fly ash Substances 0.000 claims description 9
- 238000005065 mining Methods 0.000 claims description 9
- 235000019353 potassium silicate Nutrition 0.000 claims description 9
- 238000007582 slurry-cast process Methods 0.000 claims description 9
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000004927 clay Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 239000002956 ash Substances 0.000 claims description 6
- 230000033228 biological regulation Effects 0.000 claims description 6
- 238000005056 compaction Methods 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 238000003306 harvesting Methods 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 claims description 3
- 239000010883 coal ash Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000000280 densification Methods 0.000 claims description 3
- 230000010339 dilation Effects 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 238000010348 incorporation Methods 0.000 claims description 3
- 238000001764 infiltration Methods 0.000 claims description 3
- 230000008595 infiltration Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000010412 perfusion Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 238000012876 topography Methods 0.000 claims description 2
- 239000002689 soil Substances 0.000 abstract description 4
- 238000009510 drug design Methods 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 description 11
- 238000003756 stirring Methods 0.000 description 10
- 230000004888 barrier function Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012812 general test Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 238000001303 quality assessment method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 210000004911 serous fluid Anatomy 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 238000009955 starching Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Underlie coal mine gob Grouting method the invention discloses a kind of Along Railway, stop the rational design of slurry, mortar depositing construction sequence and grouting quality detection by drilling arrangement, drilling construction method, grouting mode, grouting parameter, injected hole, pass through goaf grouting engineering, reduce the mined out influence generated to superficial part foundation soil strength of deep formation, differential settlement amount is reduced, ground Rock And Soil overall performance is improved.Goaf geological disaster hidden danger is eliminated or reduced to greatest extent by administering, it is ensured that safe railway operation and social harmony are stablized.
Description
Technical field
The invention belongs to goaf Treatment Methods field, underlie coal mine gob slip casting more particularly to a kind of Along Railway
Treatment Methods.
Background technique
The coal mining of China's many years has been accumulated to form or formed a large amount of, different depth, area not etc., very
To the goaf of multilayer position.Goaf is an extremely complex geologic body, has concealment, complexity, sudden and long-term
The characteristics of property.And with the rapid development of Environment in Railway Engineering Construction, many railway projects can not all be avoided and pass through coal mine gob.
The complex environments such as the increase of railway transportation capability, the construction of multiple line, train dynamic loading and extreme rain and snow weather are to mining rock
It influences, is easier to cause earth's surface deformation and excavation collapse, influences the stability of railway bed, threaten the safety of railway transportation, be
The big serious problems that railway operation must solve.
The research in railway goaf at present be concentrated mainly on decision making for evaluating railway location schemes, detection, estimation of stability, Treatment process and
Governance quality judges several aspects.Underlie the improvement in goaf for railway, based on experience, mainly according to the geology in goaf
The methods of Caving Method with Large Space, filling method, supporting methods, closing isolation method is respectively adopted in feature, wherein grouting filling is most popular method.
In goaf grouting punishment, due to the exploitation situation in goaf, geological conditions, dynamic load(loading) difference, resolution also not phase
Together.In terms of highway underlies goaf harnessing, " goaf slip casting treatment method of road " (China Patent Publication No. is had issued for
102330567 A of CN, publication date on January 25th, 2012), form " Mined out Zone of Expressway (cavity) prospective design and construction
Administer handbook " (Traffic Dept., Shanxi Prov., Zhongjiao Tongli Highway Exploration Design Engineering Co., Ltd. chief editor, People's Transportation Press,
2005), and normative method is had not yet been formed to Along Railway goaf punishment of underliing, especially for large-scale, multilayer complexity
Goaf, regulation method, reinforcing scope and depth, quality assessment standard all lack system achievement, not yet formed it is mature
Theoretical and engineering design system, no specification, regulation can be followed.
Summary of the invention
To solve the above problems, underliing coal mine gob Grouting method the present invention provides a kind of Along Railway, lead to
It crosses improvement and eliminates or reduce to greatest extent goaf geological disaster hidden danger, it is ensured that safe railway operation and social harmony are stablized.
To achieve the above object, the technical scheme adopted by the invention is as follows:
A kind of Along Railway underlies coal mine gob Grouting method, including operates as follows
(1) drilling arrangement
According to the experiment of indoor grouting and reinforcing and correlation engineering experience, the railway goaf grout spreading range that underlies is designed as
5m, injected hole is uniformly distributed in " quincunx " in plane.Array pitch 10m.It is operated normally not influence railway, while reaching improvement effect
Fruit infuses slurries to rail lower part, inclined hole bore inclining angle is 75 ° to 80 ° close to railway straight hole interpolation inclined hole.It checks
Hole number is the 2%-3% of injected hole total amount, and depth is at original ground to goaf (coal seam) bottom plate.
(2) drilling construction method
Drilling machine preferably uses rotary drill and the carbide drill drilling machine with core barrel.Drilling construction method is according to mined out
The selection of area's stratum characteristic.
1) unconsolidated formation drilling construction method: 146 drill bit aperture of Φ is used, with 146 casing of Φ to the complete hard formation of basement rock, lower Φ
Then 127 screen casings pull out 146 casing of Φ, consolidate well head 3-5m with cement to basement rock.
2) rock section drilling construction method: rock section adopts rotary drilling, and it is (or compound to the complete drill bit of Φ 110mm to change diameter
Chip) revolution coring clear water drilling mode, drilling to predetermined design hole depth, i.e. 0.5m under goaf.
(3) grouting mode
Grouting mode uses orifice closing packed press method slip casting from bottom to top.Reveal goaf status depending on drilling, is divided to two classes
Three kinds of grouting process.
1) railway two sides 30m range combines mode with compaction grouting using high-pressure injection, static pressure filling.Wherein curtain
Injected hole (straight hole) is combined using high-pressure rotary-spray and fixed spray, and the closely knit curtain wall calculus with one fixed width is formed after consolidation
Body.This method is to connect slurry casting machine with high-pressure slip-casting guard system, is placed at the 0.5m of bottom hole, and aperture is stopped using ball-valve type grout stopping device
Slurry, to realize the filling consolidation slip casting of goaf one-part form.Squeeze pack is consolidated injected hole and is filled and densification phase using static pressure type
In conjunction with slip casting diffusion principle, aperture ball-valve type grout stopping device is only starched.Aperture slurry casting machine directly enters bottom hole up side in 0.5m curtain body, real
Large volume filling consolidation slip casting in the curtain body of goaf under existing railway bed.
2) for other goafs, using static pressure filling and compaction grouting.Slip casting aperture slurry casting machine directly enters bottom hole (goaf
0.5m under bottom plate), aperture is only starched using ball-valve type grout stopping device.
It is unlikely to flow away downstream to make slurries form heap body if 3) goaf water-filling, two-tube slip casting, a pipe are used when slip casting
Cement-flying ash mortar is injected, a pipe injects accelerator, to form effective heap body.
(4) grouting parameter
1) grout coordinate ratio
Slip casting discloses goaf status and grouting mode according to drilling, reinforces rock stratum using different injecting paste materials and proportion.
Concentration of slurry generally according to experiment and combines Practical Project to determine.
1. for cavitation area (no caving goaf) fill-type consolidate slip casting, using cement, flyash, coarse sand, fine sand and
Water mixing is used as injecting paste material, and strength grade is reached C15-C20, completed using mass pumping mode.If having ready conditions, it is suitable to add
Clay is measured, is used as rapid hardening early strong regulator according further to practical plus waterglass, sodium carbonate etc..Pass through experiment, it is proposed that choose cooperation
Than being 0.5 for the ratio of mud, the scheme that sand coarse aggregate ratio is 0.38 carries out the configuration of concrete and coal ash+sand+microlith slurries.
2. for there is a caving goaf, no matter the high pressure jet grouting in curtain hole or the static pressure grouting in other holes, use
Cement, flyash and water are mixed to form Cement fly ash as injecting paste material, can according to the actual situation, add a small amount of clay or
Medium coarse sand uses water-solid ratio for 1: 1.2, admittedly it is relatively reasonable to be comparably 2: 8；Incorporation accelerator (selecting waterglass) is modified,
Water glass content 3% is relatively rationally.
2) grouting pressure (terminating pressure)
Railway underlies goaf static pressure injection method 1.0~1.5MPa of grouting pressure, and pressure reaches 2.0~3Mpa in the short time
(deep takes large values, and gets the small value within superficial part 6m)；The high-pressure water shot flowing pressure of high pressure jet grouting is preferably greater than 25MPa, and flow is big
In 30L/min.
3) terminate midge amount
Using static pressure grouting, terminates midge amount and be less than 70L/min, stablize 10-15min or more, the hole slip casting can be terminated
Construction；When using high pressure jet grouting, after cement slurry returns out out of hole, slip casting can be stopped.
4) slurries consolidating strength
Railway underlie goaf disposition slurries Seed harvest unconfined compressive strength be no less than 2MPa.
5) goaf harnessing area
Goaf harnessing area is according to " building, water body, railway and main roadway coal column, which stay, to be set and mining pressed coal regulation "
It calculates and determines, it is to guard range that specific method, which is with width of railway subgrade formation, increases Safe width outward, and then unconsolidated formation presses 45 °
Angle calculates mobile bandwidth, and basement rock calculates mobile bandwidth by 70 ° of angles, is finally added as goaf harnessing length or width.
Calculation formula is as follows:
B=M+H1ctgα+H2ctgβ
In formula, B- by shield border width (m),；M- safeguards that bandwidth, maintenance bandwidth take 15m；H1Loose seam's thickness
(m)；H2Bedrock thickness (m)；α-unconsolidated formation traveling angle, 45 ° of value；Beta-yl rock traveling angle, 70 ° of value.
6) grouting amount
Grouting amount is calculated by the following formula:
Q=ASmK Δ V η (1-e)/C
In formula: Q- goaf grouting amount (m3)；S- is goaf harnessing area, and total area of administering is goaf harnessing length
With the product of goaf harnessing width, m2.When goaf harnessing width is inconsistent, average value can be used；When single hole slip casting, S
=π R2, R is the effective dilation angle of slurries, is calculated by pitch-row half；M- goaf coal seam thickness (m)；The goaf Δ V- is remaining empty
Gap rate, value is between 0.2-1.The mine time is closed under normal circumstances within 5 years, and value is between 0.3-1；The mine time is closed 5
Year or more, value is between 0.2-0.3.When the top plate in goaf and overlying strata are harder rock, value is preferably slightly larger；K- coal
The layer rate of extraction.It is general to be determined by mining factual survey；A- slip casting total amount slurries loss factor, value is between 1.0-2.0；η-
Grouting filling coefficient, value is between 0.75-0.95.The value is preferably determined according to the property of railway engineering, within the scope of roadbed
Goaf value between 0.75-0.85；For structures range goaf value between 0.85-0.95；C- slurries
Calculus rate, value is between 0.7-0.95.As it is tests determined.This experiment takes 0.82；The goaf e- is given up porosity, according to engineering
It is practical, it is proposed that take 0.2-0.5.
It should be noted that each hole site is different, lithology is different, extent of cavitation is different, individual hole plasma volumes may be more than
Average plasma volume is big, and the plasma volume of design may also be not achieved in individual holes.
7) slip casting ending standard
Using static pressure grouting, when grouting pressure reaches design maximum pressure, and injection rate is less than 0.4L/min, Continuous Perfusion
60min；Or when being not more than 1L/min, continues that 30min is perfused, slip casting can be stopped.When using high pressure jet grouting, to cement
After slurry returns out out of hole, slip casting can be stopped.
(5) injected hole is only starched
Injected hole, which is only starched preferably to use, simply stops the methods of slurry processes or ball-valve type stop grouting plug, casing only slurry like ring flange.Like method
Blue disk simply stops slurry processes and diameter is preferably used to be less than φ 50mm steel pipe as Grouting Pipe, and a size and open pore size are welded in one end
The ring flange being close at tripping in injected hole variable diameter, will be blocked with a small amount of rubble clay like the gap between ring flange and hole wall,
Then cemented together using 1: 2 cement slurry or No. 42.5 quick-hardening cement thick slurry Grouting Pipes and hole wall, grout pouring height is not
It should be less than 8m.
(6) mortar depositing construction sequence
It is required that as follows:
1) injected hole should carry out field survey setting-out using total station or theodolite, and bore position is not to be exceeded sets in principle
Position 1.0m is counted, really because of the influence of topography, drilling cannot be placed on design position, after design liaison is agreed to, can carry out appropriate adjustment.
2) first construct curtain hole, injected hole of constructing afterwards.By seam inclination direction, the low drilling in goaf of first constructing, after apply
The high drilling in work goaf.
3) control of hole depth should accomplish that injected hole or curtain hole are drilled at goaf (or coal seam) bottom plate or less 0.5m.
4) drilling open pore size preferably controls between 130-150mm, and after variable diameter once or twice, whole hole aperture is not answered small
In 91-110mm.Also, injected hole and curtain hole should all enter variable diameter at complete basement rock 8-10m.
5) slip casting caliber should select diameter to be not less than the steel pipe of φ 50mm or φ 127mm, and when need to put into aggregate, caliber is not answered
Less than φ 89mm.
6) quantity in coring hole should be the 3%-5% of injected hole and curtain hole sum, and drilling has the goaf portion of caving zone
Position, core recovery are no less than 30%, and no goaf position core recovery is no less than 75%.
7) concentration of slurry should first dilute rear thick.When slip casting, it should be avoided and inject a large amount of cement and flying ash grout in a short time, when
When grouting amount is larger, it should be constructed using intermittent slip casting method.
8) in order to avoid disturbance railway basis when drilling and slip casting, start to construct to 3 hole of both sides interval from interstitial hole.
(7) grouting quality detects
According to railway goaf harnessing experience, slip casting detection is carried out using following method:
1) progress pore-forming verifying in 6 months after slip casting, through hole inner core pulling directly observe slurries filling, cementing and infiltration feelings
Condition, the leakage situation of slurries and the stability of hole wall in drilling process measure consolidating strength, overall merit grouting quality.
2) geophysical method and in-situ testing technique (wave velocity testing) are used, grouting treatment effect is monitored.
3) quality examination should be arranged in the location there may be problem, check hole number should account for total hole count 2%~
3%.
4) due to the uncertainty of physical prospecting, inlet well is likely encountered no goaf, and there are situations, to guarantee grouting quality,
Monitoring construction party is constructed as required, and drilling will stay core regardless of whether get to goaf before each hole to the acceptance of work.It is right
There is caving goaf, core recovery is no less than 30%, has drilling tool to have the relative recording of buffering phenomenon and goaf leak；Nothing
Goaf position core recovery is no less than 75%.
The present invention reduces the mined out influence generated to superficial part foundation soil strength of deep formation by goaf grouting engineering,
Differential settlement amount is reduced, ground Rock And Soil overall performance is improved.By with administering elimination or maximum reduction goaf
Matter Hidden hazrads, it is ensured that safe railway operation and social harmony are stablized.
Detailed description of the invention
Fig. 1 is complete opening once grouting schematic diagram.
Fig. 2 is goaf static pressure grouting construction flow chart.
Fig. 3 is goaf grouting hole profilograph.
Fig. 4 is goaf grouting hole drawing in side sectional elevation.
Specific embodiment
In order to which objects and advantages of the present invention are more clearly understood, the present invention is carried out with reference to embodiments further
It is described in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit this hair
It is bright.
Grouting equipment used in following embodiment and equipment need to meet claimed below:
(1) drilling machine: drilling machine should be according to the strata structure in goaf, lithology, injected hole or the structure in curtain hole, only slurry technology
Equal requirements are selected.Impact drill or the drilling tool of non-coring should not use, and preferably use rotary drill and with core barrel
Carbide drill drilling machine.
(2) revolving speed of blender and slurrying capacity should be adapted with the performance of project amount, slurries type and grouting pump, stirring
Slurries afterwards are uniform.
Blender is placed among the stirring pool built, and the stirring pool built should meet normal construction requirement, and stirring pool is circle
Cylinder, for quantity according to execution conditions, 2 stirring pools, each diameter 2m, high 2m are at least built in each goaf.Flyash is placed on
Level-one stirring pool flows into second level stirring pool, not using the travelling mixer above stirring pool with being slurried after hydraulic giant percussion
Disconnected stirring guarantees that slurries are not solidified in stirring pool, and 4h is not to be exceeded in the residence time.
(3) grouting pump preferably uses variable pump, and no less than 2, each slurry station, maximum plasma discharge amount should meet goaf grouting
With the needs of construction speed；Its maximum pump pressure is preferably not less than 4MPa.
(4) grouting pipeline and its connecting portion, it is necessary to maximum 1.5-2 times of grouting pressure can be born.Grouting pipeline corner
Curve bend connection can be used.
(5) grouting pump, pressure gauge must be installed at injected hole (or curtain hole) aperture.
(6) water pump preferably selects immersible pump.The displacement of pump and the quantity of pump should meet the needs of engineering.
(7) hole sealing device: using φ 50mm steel pipe, and a circular flange pallet (pallet is welded at the 20-30cm of pipe front end
Diameter is φ 120-130mm), in tripping in hole at variable diameter.
(8) goaf uses flowmeter, preferably uses special slip casting flowmeter；Stop grouting plug should be simple and convenient to operate, only as far as possible
Slurry is reliable, and two-tube stop grouting plug and self-control are like ring flange grout stopping device in common hole；Grout pipe line often uses seamless steel pipe, seamed steel pipe and
High-pressure rubber pipe.
In addition, mixing plant should at least establish 1 pond according to construction slip casting total amount needs, each goaf, each
400m3, guarantee normal construction.Meanwhile slip casting attachment set stock ground: want smooth to the stock ground of heap putting material, haul vehicle is normal
It is current, and close to blender, so that material is readily transported, carried, it is desirable that be equipped with damp-proof layer, rain-proof measure.
Underlie coal mine gob Grouting method the embodiment of the invention provides a kind of Along Railway, specifically includes as follows
Operation:
Drilling arrangement
Array pitch, the pitch-row of injected hole (or curtain hole) are generally determined through field test.When that can not be tested, suitable basis
Gap, the crack of coal-mining method, overlying strata earth formation and lithology, coal seam recovery ratio, roof controlling method, caving zone and fracture belt
Between connectivity, and referring to empirical value (table 6-20) design.When coal seam recovery ratio is big, top plate is hard, caving zone and fracture belt
Demonstration gap, connectivity is good between crack, can take large values, on the contrary then get the small value.When mined out caving zone and fracture belt midge are larger,
It takes large values, otherwise gets the small value.When goaf is located at general section, can take large values, it is on the contrary then get the small value.
5m is designed as according to the experiment of indoor grouting and reinforcing and correlation engineering experience, one's respective area grout spreading range, in plane
Injected hole is uniformly distributed in " quincunx ".Array pitch 10m.It is operated normally not influence railway, while reaching regulation effect, close
Railway straight hole interpolation inclined hole infuses slurries to rail lower part, and inclined hole bore inclining angle is 75 ° to 80 °.Check that hole number is note
The 2%-3% of hole total amount is starched, depth is at original ground to goaf (coal seam) bottom plate.Hole structure requires as follows:
(1) hole depth injected hole or curtain hole should be drilled at goaf (or coal seam) bottom plate or less 0.5m.
(2) borehole open pore size preferably controls between 130-150mm, after variable diameter once or twice, whole hole aperture
No less than 91-110mm.
(3) variable diameter position injected hole and curtain hole should all enter variable diameter at complete basement rock 8-10m.
(4) quantity in coring hole coring hole should be the 3%-5% of injected hole and curtain hole sum, and drilling has caving zone
Goaf position, core recovery are no less than 30%, and no goaf position core recovery is no less than 75%.
1 injected hole of table and curtain hole array pitch and pitch-row empirical value list
Drilling construction method
(1) unconsolidated formation drilling construction method
Using 146 drill bit aperture of Φ, with 146 casing of Φ to the complete hard formation of basement rock, then lower 127 screen casing of Φ is pulled out to basement rock
Except 146 casing of Φ, well head 3-5m is consolidated with cement.
(2) rock section drilling construction method
Rock section adopts rotary drilling, changes diameter and bores to the complete drill bit of Φ 110mm (or compound chip) revolution coring clear water
Into mode, drilling to predetermined design hole depth, i.e. 0.5m under goaf.
Grouting mode
Grouting mode uses orifice closing packed press method slip casting from bottom to top；Slip casting caliber should select diameter not less than φ
The steel pipe of 50mm or φ 127mm, when need to put into aggregate, caliber is no less than φ 89mm.Reveal goaf status depending on drilling, is divided to two classes
Three kinds of grouting process.
(1) railway two sides 30m range combines mode with compaction grouting using high-pressure injection, static pressure filling.Wherein curtain
Injected hole (straight hole) is combined using high-pressure rotary-spray and fixed spray, and the closely knit curtain wall calculus with one fixed width is formed after consolidation
Body.This method is to connect slurry casting machine with high-pressure slip-casting guard system, is placed at the 0.5m of bottom hole, and aperture is stopped using ball-valve type grout stopping device
Slurry, to realize the filling consolidation slip casting of goaf one-part form.Squeeze pack is consolidated injected hole and is filled and densification phase using static pressure type
In conjunction with slip casting diffusion principle, aperture ball-valve type grout stopping device is only starched.Aperture slurry casting machine directly enters bottom hole up side in 0.5m curtain body, real
Large volume filling consolidation slip casting in the curtain body of goaf under existing railway bed.
(2) for other goafs, using static pressure filling and compaction grouting.It is (mined out that slip casting aperture slurry casting machine directly enters bottom hole
0.5m under area's bottom plate), aperture is only starched using ball-valve type grout stopping device.
(3) unlikely to flow away downstream to make slurries form heap body if goaf water-filling, two-tube slip casting, a pipe are used when slip casting
Cement-flying ash mortar is injected, a pipe injects accelerator, to form effective heap body.
Grouting parameter
(1) grout coordinate ratio
Concentration of slurry is the physical quantity for measuring fluid viscosity size.The size of concentration of slurry directly affects the diffusion of slurries
Radius, while the determination of the parameters such as the pressure of slurries, flow is also determined, to influence slip casting effect.This slip casting according to
Drilling discloses goaf status and grouting mode, reinforces rock stratum using different injecting paste materials and proportion.Injecting paste material and slurries are dense
Degree uses, and is generally determined according to experiment and combination Practical Project.
1) for cavitation area (no caving goaf) fill-type consolidate slip casting, using cement, flyash, coarse sand, fine sand and
Water mixing is used as injecting paste material, and strength grade is reached C15-C20, completed using mass pumping mode.If having ready conditions, it is suitable to add
Clay is measured, is used as rapid hardening early strong regulator according further to practical plus waterglass, sodium carbonate etc..Pass through experiment, it is proposed that choose cooperation
Than being 0.5 for the ratio of mud, the scheme that sand coarse aggregate ratio is 0.38 carries out the configuration of concrete and coal ash+sand+microlith slurries.
2) for there is a caving goaf, no matter the high pressure jet grouting in curtain hole or the static pressure grouting in other holes, use
Cement, flyash and water are mixed to form Cement fly ash as injecting paste material, can according to the actual situation, add a small amount of clay or
Medium coarse sand.By experiment, consider just, final setting time and compression strength, use water-solid ratio more to be closed admittedly being comparably 2: 8 for 1: 1.2
Reason；Incorporation accelerator (selecting waterglass) is modified, and Water glass content 3% is relatively rationally.
The concentration use of slurries should be determined in conjunction with reality by field experiment in addition to using experiment proportion.
(2) grouting pressure (terminating pressure)
Grouting pressure is control grouting quality, improves an important factor for slip casting benefit.Terminate pressure and mined out collapse splits band
Gap, the size in crack or the correlations such as how many, hydrogeology and engineering properties condition, it is general by after live grouting test really
It is fixed.It when without live grouting test data, can also be drafted in advance with experience, be adjusted again during slip casting.
Railway underlies, and pressure reaches 2.0 to goaf static pressure injection method grouting pressure generally in 1.0~1.5MPa, short time
~3Mpa (deep takes large values, and gets the small value within superficial part 6m)；The high-pressure water shot flowing pressure of high pressure jet grouting is preferably greater than 25MPa,
Flow is greater than 30L/min.
(3) terminate midge amount
In general, terminate midge amount when grouting pressure reaches design value (terminating pressure) using static pressure grouting and get over
Small, construction quality is better, terminates midge amount and is less than 70L/min, stablizes 10-15min or more, can terminate the hole mortar depositing construction.
When using high pressure jet grouting, after cement slurry returns out out of hole, slip casting can be stopped.
(4) slurries consolidating strength
Railway underlie goaf disposition slurries Seed harvest unconfined compressive strength be no less than 2MPa.
(5) goaf harnessing area
Goaf harnessing area is according to " building, water body, railway and main roadway coal column, which stay, to be set and mining pressed coal regulation "
It calculates and determines, it is to guard range that specific method, which is with width of railway subgrade formation, increases Safe width outward, and then unconsolidated formation presses 45 °
Angle calculates mobile bandwidth, and basement rock calculates mobile bandwidth by 70 ° of angles, is finally added as goaf harnessing length or width.
Calculation formula is as follows:
B=M+H1ctgα+H2ctgβ
In formula, B- by shield border width (m),；M- safeguards that bandwidth, maintenance bandwidth take 15m；H1Loose seam's thickness
(m)；H2Bedrock thickness (m)；α-unconsolidated formation traveling angle, 45 ° of value；Beta-yl rock traveling angle, 70 ° of value.
(6) grouting amount
1) grouting amount calculates
Slip casting total amount can be calculated by following formula
QAlways=ASmK Δ V η/C
In formula: QAlwaysTotal grouting amount (the m in goaf3)。
S- is goaf harnessing area, and value is the product (m of goaf harnessing length and goaf harnessing width2).When
When goaf harnessing width is inconsistent, average value can be used.
M- goaf coal seam thickness (m).
The goaf Δ V- residue voidage: after i.e. coal seam is plucked out of, former space is remaining after being collapsed the filling of inbreak sillar
Gap, value is between 0.2-1.The value can be determined by 3 kinds of modes: a) the existing sedimentation in mine and goaf observation money
Material: the largest settlement on above goaf ground is first calculated, completed settling amount is determined by existing observational data, so
It is estimated afterwards with the ratio between the largest settlement on the difference of the two and ground；B) money in cavity and crack in hole is reconnoitred during prospecting
Material: the ratio between empty i.e. in through hole and cranny development average height and coal mining thickness are estimated；C) this area is existing
Engineering data.The mine time is closed under normal circumstances within 5 years, and value is between 0.3-1；The mine time is closed at 5 years or more, value exists
Between 0.2-0.3.When the top plate in goaf and overlying strata are harder rock, value is preferably slightly larger.The design takes 0.6.
K- coal seam recovery ratio.It is general to determine that the design takes 0.5 by mining factual survey.
A- slip casting total amount slurries loss factor, for value between 1.0-1.5, the design takes 1.2.
η-grouting filling coefficient, value is between 0.75-0.95.The value is preferably determining according to the property of railway engineering, for
Goaf value within the scope of roadbed is between 0.75-0.85；For structures range goaf value 0.85-0.95 it
Between.The design takes 0.85.
C- slurries calculus rate, value is between 0.7-0.95.It is general tests determined.This experiment takes 0.82.
According to engineering reality, the useless porosity in goaf is taken as 0.3.
2) single hole grouting amount calculates
Single hole grouting amount can be calculated according to the following formula:
QIt is single=A π R2·m·ΔV·η/C
In formula: QIt is single--- single hole grouting amount (m3)；
A --- single hole grouting amount slurries loss factor, value is between 1.2-2；
R --- the effective dilation angle of slurries calculates (m) by the half of pitch-row, this engineering is 5m；
The same above formula of other symbolic significances.
Then having each goaf single hole grouting amount is about 60m3.It should be noted that each hole site is different, lithology is different, empty
Change degree is different, and individual hole plasma volumes may be big more than average plasma volume, and the plasma volume of design may also be not achieved in individual holes.
(7) slip casting ending standard
Using static pressure grouting, when grouting pressure reaches design maximum pressure, and injection rate is less than 0.4L/min, Continuous Perfusion
60min；Or when being not more than 1L/min, continues that 30min is perfused, slip casting can be stopped.When using high pressure jet grouting, to cement
After slurry returns out out of hole, slip casting can be stopped.
Injected hole is only starched
Injected hole, which is only starched preferably to use, simply stops the methods of slurry processes or ball-valve type stop grouting plug, casing only slurry like ring flange.Like method
Blue disk simply stops slurry processes and diameter is preferably used to be less than φ 50mm steel pipe as Grouting Pipe, and a size and open pore size are welded in one end
The ring flange being close at tripping in injected hole variable diameter, will be blocked with a small amount of rubble clay like the gap between ring flange and hole wall,
Then cemented together using 1: 2 cement slurry or No. 42.5 quick-hardening cement thick slurry Grouting Pipes and hole wall, grout pouring height is not
It should be less than 8m (Fig. 1).In drilling process easy collapse hole, easy necking down plug-hole a coal seam goaf, or when being needed in inlet well
When launching aggregate, casing is preferably used only to starch.
Mortar depositing construction sequence
Mortar depositing construction sequence is shown in Fig. 2, and grouting sequence and requirement are as follows:
(1) first construct curtain hole, injected hole of constructing afterwards.By seam inclination direction, the low drilling in goaf of first constructing, after apply
The high drilling in work goaf.
(2) concentration of slurry should first dilute rear thick.When grouting starts, the midge amount and pump pressure for time sight to pump, record grouting
The various phenomenons occurred in the process adjust grouting quantity and concentration of slurry in time according to the actual situation.
(3) when occurring a large amount of running pulps of ground crack during slip casting, intermittent slip casting should be used, or reduce pump amount and adopt
The measures such as earth's surface filling fracture are taken, slurries is prevented to be largely lost from ground.
(4) when slip casting, it should be avoided and inject a large amount of cement and flying ash grout in a short time, when grouting amount is larger, Ying Cai
It is constructed with intermittent slip casting method.
(5) in the slip casting latter stage of grout hole, pump pressure is gradually risen, and when pump amount is less than 70L/min, aperture pressure should be
Between 1.0~1.5Mpa, the stable time should be 10-15min.
(6) in order to avoid disturbance railway basis when drilling and slip casting, start to construct to 3 hole of both sides interval from interstitial hole.
Grouting quality detection
According to railway goaf harnessing experience, slip casting detection is carried out using following method:
(1) progress pore-forming verifying in 6 months after slip casting, through hole inner core pulling directly observe slurries filling, cementing and infiltration feelings
Condition, the leakage situation of slurries and the stability of hole wall in drilling process measure consolidating strength, overall merit grouting quality.
(2) geophysical method and in-situ testing technique (wave velocity testing) are used, grouting treatment effect is monitored.
(3) quality examination should be arranged in the location there may be problem, check hole number should account for total hole count 2%~
3%.
(4) due to the uncertainty of physical prospecting, inlet well is likely encountered no goaf, and there are situations, to guarantee slip casting matter
Amount, monitoring construction party are constructed as required, and drilling will stay rock regardless of whether get to goaf before each hole to the acceptance of work
Core.To there is caving goaf, core recovery is no less than 30%, has drilling tool to have the related note of buffering phenomenon and goaf leak
Record；No goaf position core recovery is no less than 75%.
Special technique construction
Preparation before drilling
Hole location unwrapping wire must be carried out before drilling, ± 3m is not to be exceeded in hole location deviation, there is buildings or structures or underground pipe canal etc.
When needing to adjust hole location, Party A must be reported, after Party A and design side agree to, is executed by design alteration.
It is first contacted with relevant department before drilling, finds out that whether there is or not cable pipeline, upper and lower conduit line and other barriers for underground, bore
Hole will avoid above-mentioned barrier, if injected hole is located near above-mentioned barrier, need artificial aperture Φ 300mm, depth reaches barrier
Hinder object upper surface or less 0.5m, is strictly without above-mentioned pipeline and when barrier through probing, Cai Keyong drilling machine is normally crept into.
Preparation before slip casting
Ying Xianyong clear water hole flushing 10min or so (return water of being subject to is limpid) and water leakage is observed before slip casting, makees corresponding note
Record, after hole flushing, lower Grouting Pipe and slip casting core.Slip casting core should be down toward bottom hole.
Before starting slip casting, every place should choose a hole and first do segmentation packer permeability test, and note down, to grasp the initial of rock stratum
Permeability.
Check whether slip casting equipment is intact, and whether Grouting Pipe is unobstructed.
Pressure gauge should be at normal working condition.
Slip casting abnormal conditions treatment measures
During slip casting, especially in pressure process, surface state and grouting pressure around close observation injected hole are answered.If note
Pressure is starched decline phenomenon suddenly occur or when extremely serious spillage, notify Party A and design side immediately, through with Party A and design side
After research ascertains the reason, decide whether to continue slip casting.If running pulp or ground drum occurs in ground during slip casting, 8 hours can be suspended
It infuses again above, until reaching slip casting ending standard.
In slip casting area and its neighbouring underground ditch, slot, channel etc., checkpoint should be carried out before slip casting, is answered during slip casting
There is special messenger to check at any time, in case running pulp causes unnecessary loss or harm.
It meets slip casting at the beginning or slip casting time not long pressure rise or not into slurry, can first be rinsed with clear water.
Met during slip casting pressure lower (be less than 0.3MPa) answer close observation whether spillage, running pulp, it is higher to meet pressure
When (being greater than 3.0MPa), it not stop slip casting immediately, sometimes because temporary blocking makes pressure rise, should support 1 minute or use
Clear water rinses.
The requirement of slip casting continuity
The supply of grouting equipment, utensil, material must assure that the continuity of slip casting, prevent from starching since slip casting is interrupted in crack
Liquid solidification, makes subsequent grouting serous fluid be not easy to spread, influences slip casting effect.
Agitator or slurry storing tank capacity must can guarantee the requirement of continuous grouting.
It must assure that the waterglass ratio of the slurries ratio of mud and addition meets design requirement.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, it can also make several improvements and retouch, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (1)
- A kind of coal mine gob Grouting method 1. Along Railway underlies, it is characterised in that: including operating as follows(1) drilling arrangementThe railway goaf grout spreading range that underlies is designed as 5m, and injected hole is uniformly distributed in " quincunx " in plane；Array pitch 10m；Close to railway straight hole interpolation inclined hole, slurries are infused to rail lower part, inclined hole bore inclining angle is 75 ° to 80 °；It checks Hole number is the 2%-3% of injected hole total amount, and depth is at original ground to gob floor；(2) drilling construction methodDrilling construction is carried out using rotary drill and the carbide drill drilling machine with core barrel, construction method is according to goaf Stratum characteristic selection:1) unconsolidated formation drilling construction method: 146 drill bit aperture of Φ is used, with 146 casing of Φ to the complete hard formation of basement rock, lower Φ 127 Then screen casing pulls out 146 casing of Φ, consolidates well head 3-5m with cement to basement rock；2) rock section drilling construction method: rock section adopts rotary drilling, changes diameter and bores to the complete drill bit of Φ 110mm or compound chip Head revolution coring clear water creeps into mode, drilling to predetermined design hole depth, i.e. 0.5m under goaf；(3) grouting modeUsing orifice closing packed press method slip casting from bottom to top；Reveal goaf status depending on drilling, be divided to two classes three kinds of grouting process:1) railway two sides 30m range combines mode with compaction grouting using high-pressure injection, static pressure filling；Wherein, curtain-grouting Hole is combined using high-pressure rotary-spray and fixed spray, the closely knit curtain wall Seed harvest with one fixed width is formed after consolidation, this method is Slurry casting machine is connect with high-pressure slip-casting guard system, is placed at the 0.5m of bottom hole, aperture is only starched using ball-valve type grout stopping device, thus real Existing goaf one-part form filling consolidation slip casting；Squeeze pack consolidation injected hole combines slip casting expansion with densification using static pressure type filling Principle is dissipated, aperture ball-valve type grout stopping device is only starched；Aperture slurry casting machine directly enters bottom hole up side in 0.5m curtain body, realizes railway bed Large volume filling consolidation slip casting in lower goaf curtain body；2) for other goafs, using static pressure filling and compaction grouting；Slip casting aperture slurry casting machine directly enters bottom hole, is located at goaf 0.5m under bottom plate, aperture are only starched using ball-valve type grout stopping device；It is unlikely to flow away downstream to make slurries form heap body if 3) goaf water-filling, two-tube slip casting, pipe injection are used when slip casting Cement-flying ash mortar, a pipe injects accelerator, to form effective heap body；(4) grouting parameter1) grout coordinate ratio1. consolidating slip casting using fill-type for no caving goaf, specifically, using the ratio of mud is 0.5, sand coarse aggregate ratio is 0.38 Scheme carries out the configuration of concrete and coal ash+sand+microlith slurries and is completed by mass pumping mode；2. for there is a caving goaf, no matter the high pressure jet grouting in curtain hole or the static pressure grouting in other holes, using cement, Flyash and water are mixed to form Cement fly ash as injecting paste material, can according to the actual situation, add a small amount of clay or in it is thick Sand uses water-solid ratio for 1: 1.2, admittedly it is comparably 2: 8 configuration；Incorporation waterglass is modified, Water glass content 3%；2) grouting pressureRailway underlies goaf static pressure injection method 1.0~1.5MPa of grouting pressure, and pressure reaches 2.0~3Mpa in the short time, deep Portion takes large values, and gets the small value within superficial part 6m；The high-pressure water shot flowing pressure of high pressure jet grouting is preferably greater than 25MPa, and flow is greater than 30L/min；3) terminate midge amountUsing static pressure grouting, terminates midge amount and be less than 70L/min, stablize 10-15min or more, the bored grouting can be terminated and applied Work；When using high pressure jet grouting, after cement slurry returns out out of hole, slip casting can be stopped；4) slurries consolidating strengthRailway underlie goaf disposition slurries Seed harvest unconfined compressive strength be no less than 2MPa；5) goaf harnessing areaGoaf harnessing area is calculated according to " building, water body, railway and main roadway coal column, which stay, to be set and mining pressed coal regulation " It determines, it is to guard range that specific method, which is with width of railway subgrade formation, increases Safe width outward, then unconsolidated formation is based on 45° angle Mobile bandwidth is calculated, basement rock calculates mobile bandwidth by 70 ° of angles, is finally added as goaf harnessing length or width, calculates Formula is as follows:B=M+H1ctgα+H2ctgβIn formula, B- is by shield border width (m)；M- safeguards that bandwidth, maintenance bandwidth take 15m；H1Loose seam's thickness (m)；H2Base Rock thickness (m)；α-unconsolidated formation traveling angle, 45 ° of value；Beta-yl rock traveling angle, 70 ° of value；6) grouting amountGrouting amount is calculated by the following formulaQ=ASmK Δ V η (1-e)/CIn formula: Q- goaf grouting amount (m3)；S- is goaf harnessing area, and total area of administering is goaf harnessing length and adopt The product of width, m are administered in dead zone2；When goaf harnessing width is inconsistent, average value can be used；When single hole slip casting, S=π R2, R is the effective dilation angle of slurries, is calculated by pitch-row half；M- goaf coal seam thickness (m)；The goaf Δ V- residue voidage, value is between 0.2-1；The mine time is closed within 5 years, value is between 0.3-1；It closes The mine time, value was between 0.2-0.3 at 5 years or more；When the top plate in goaf and overlying strata are harder rock, value is suitable It is slightly larger；K- coal seam recovery ratio；A- slip casting total amount slurries loss factor, value is between 1.0-2.0；η-grouting filling coefficient, takes Value is between 0.75-0.95；The value is preferably determined according to the property of railway engineering, is existed for the goaf value within the scope of roadbed Between 0.75-0.85；For structures range goaf value between 0.85-0.95；C- slurries calculus rate, value exist Between 0.7-0.95；The goaf e- is given up porosity, according to engineering reality, it is proposed that take 0.2-0.5；7) slip casting ending standardUsing static pressure grouting, when grouting pressure reaches design maximum pressure, and injection rate is less than 0.4L/min, Continuous Perfusion 60min；Or when being not more than 1L/min, continues that 30min is perfused, slip casting can be stopped；When using high pressure jet grouting, to cement After slurry returns out out of hole, slip casting can be stopped；(5) injected hole is only starchedInjected hole is only starched using like ring flange, simply only slurry processes or ball-valve type stop grouting plug, casing are only starched；It is simply only starched like ring flange Method preferably uses diameter to be less than φ 50mm steel pipe as Grouting Pipe, and the flange that a size is close with open pore size is welded in one end Disk at tripping in injected hole variable diameter, will be blocked like the gap between ring flange and hole wall with a small amount of rubble clay, and then use 1: 2 Cement slurry or No. 42.5 quick-hardening cement thick slurry Grouting Pipes and hole wall are cemented together, and grout pouring height is no less than 8m；(6) mortar depositing construction sequenceIt is required that as follows:1) injected hole should carry out field survey setting-out using total station or theodolite, and design position is not to be exceeded in bore position in principle 1.0m is set, really because of the influence of topography, drilling cannot be placed on design position, after design liaison is agreed to, can carry out appropriate adjustment；2) first construct curtain hole, injected hole of constructing afterwards；By seam inclination direction, the low drilling in goaf of first constructing, rear construction is adopted The high drilling in dead zone；3) control of hole depth should accomplish that injected hole or curtain hole are drilled at goaf or seat earth or less 0.5m；4) drilling open pore size preferably controls between 130-150mm, and after variable diameter once or twice, whole hole aperture is no less than 91-110mm；Also, injected hole and curtain hole should all enter variable diameter at complete basement rock 8-10m；5) slip casting caliber should select diameter to be not less than the steel pipe of φ 50mm or φ 127mm, and when need to put into aggregate, caliber is no less than φ89mm；6) quantity in coring hole should be the 3%-5% of injected hole and curtain hole sum, and drilling has the goaf position of caving zone, rock Core taking rate is no less than 30%, and no goaf position core recovery is no less than 75%；7) concentration of slurry should first dilute rear thick；When slip casting, it should be avoided and inject a large amount of cement and flying ash grout in a short time, work as slip casting When measuring larger, it should be constructed using intermittent slip casting method；8) in order to avoid disturbance railway basis when drilling and slip casting, start to construct to 3 hole of both sides interval from interstitial hole；(7) grouting quality detectsAccording to railway goaf harnessing experience, slip casting detection is carried out using following method:1) progress pore-forming verifying in 6 months after slip casting, through hole inner core pulling are directly observed slurries filling, cementing and infiltration situation, are bored The leakage situation of slurries and the stability of hole wall during spy measure consolidating strength, overall merit grouting quality；2) grouting treatment effect is monitored with geophysical method and in-situ testing technique；3) quality examination should be arranged in the location there may be problem, check that hole number should account for the 2%~3% of total hole count；4) due to the uncertainty of physical prospecting, inlet well is likely encountered no goaf, and there are situations, to guarantee grouting quality, monitoring Construction party is constructed as required, and drilling will stay core regardless of whether get to goaf before each hole to the acceptance of work；It is emitted to having Goaf is fallen, core recovery is no less than 30%, has drilling tool to have the relative recording of buffering phenomenon and goaf leak；Without mined out Area position core recovery is no less than 75%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711499954.1A CN108240234B (en) | 2017-12-28 | 2017-12-28 | A kind of Along Railway underlies coal mine gob Grouting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711499954.1A CN108240234B (en) | 2017-12-28 | 2017-12-28 | A kind of Along Railway underlies coal mine gob Grouting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108240234A CN108240234A (en) | 2018-07-03 |
| CN108240234B true CN108240234B (en) | 2019-06-28 |
Family
ID=62698439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711499954.1A Active CN108240234B (en) | 2017-12-28 | 2017-12-28 | A kind of Along Railway underlies coal mine gob Grouting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108240234B (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109446698A (en) * | 2018-11-09 | 2019-03-08 | 昆明理工大学 | A kind of prediction technique for the three-dimensional space shape parameter that the loose crushed stone soil layer of floral tube grouting and reinforcing is formed |
| CN109440798A (en) * | 2018-12-14 | 2019-03-08 | 中铁四局集团第二工程有限公司 | A kind of Bridge Pile Foundation Construction method at coal mine gob and tunnel |
| CN110307034B (en) * | 2019-04-04 | 2020-05-22 | 中国矿业大学(北京) | Strip type grouting filling method for goaf |
| CN110017155B (en) * | 2019-05-23 | 2020-11-06 | 合肥工业大学 | Grouting reinforcement water-proof method for water-rich gravel layer of top plate of coal face |
| CN113389556A (en) * | 2020-03-12 | 2021-09-14 | 辽宁工程技术大学 | Efficient circulation ratio of slurry shield in composite stratum |
| CN111366403B (en) * | 2020-03-24 | 2022-07-01 | 山东省鲁南地质工程勘察院(山东省地勘局第二地质大队) | Device and method for detecting grouting filling treatment effect of coal mine goaf |
| CN111997685A (en) * | 2020-09-03 | 2020-11-27 | 中铁八局集团第三工程有限公司 | Construction method for highway to penetrate through coal seam goaf section |
| CN112679149B (en) * | 2020-12-25 | 2022-01-28 | 西安科技大学 | Deep mine heat storage cement mortar preparation and vertical solidification-prevention slurry conveying system and method |
| CN113339057A (en) * | 2021-06-24 | 2021-09-03 | 中国矿业大学 | Fluidized gangue layer-crossing subsequent filling coal mining system and method |
| CN113914914B (en) * | 2021-09-26 | 2023-08-15 | 吕梁学院 | Hole sealing device for monitoring grouting pressure of grouting anchor rod |
| CN114086949B (en) * | 2021-10-21 | 2023-04-11 | 航天凯天环保科技股份有限公司 | Geological exploration sampling method guided by hydraulic pressure |
| CN114233378B (en) * | 2021-12-17 | 2023-11-10 | 中国十七冶集团有限公司 | Goaf self-walking drilling grouting integrated equipment and installation and use method |
| CN114592549A (en) * | 2022-04-10 | 2022-06-07 | 吉林大学 | Method for treating source of leachate polluted underground water of valley type tailing pond |
| CN115072827A (en) * | 2022-07-20 | 2022-09-20 | 国能神东煤炭集团有限责任公司 | Mine water purification system |
| CN117052344B (en) * | 2023-08-04 | 2024-05-31 | 内蒙古平庄煤业(集团)有限责任公司老公营子煤矿 | Leakage blocking drilling method for goaf of close-range coal seam group |
| CN117661993B (en) * | 2024-01-30 | 2024-04-30 | 山西知行固废综合利用开发有限公司 | Continuous alkali-producing permeable curtain construction device for gangue storage yard |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1873674A (en) * | 2006-05-18 | 2006-12-06 | 北京交通大学 | Estimating mining subsidence under turnout cluster of dedicated railroad, and governing expert system |
| CN101906991A (en) * | 2010-07-19 | 2010-12-08 | 刘清洁 | Construction method for managing underground mined-out area or cavity |
| CN102330567A (en) * | 2011-08-19 | 2012-01-25 | 山西省交通规划勘察设计院 | Goaf slip casting treatment method of road |
| CN103899351A (en) * | 2014-03-28 | 2014-07-02 | 中冶沈勘工程技术有限公司 | Filling and reinforcing method for processing complicated goafs |
| CN105422170A (en) * | 2015-11-02 | 2016-03-23 | 安徽理工大学 | Grouting reinforcement treatment method for mid-depth goaf below building foundation |
-
2017
- 2017-12-28 CN CN201711499954.1A patent/CN108240234B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1873674A (en) * | 2006-05-18 | 2006-12-06 | 北京交通大学 | Estimating mining subsidence under turnout cluster of dedicated railroad, and governing expert system |
| CN101906991A (en) * | 2010-07-19 | 2010-12-08 | 刘清洁 | Construction method for managing underground mined-out area or cavity |
| CN102330567A (en) * | 2011-08-19 | 2012-01-25 | 山西省交通规划勘察设计院 | Goaf slip casting treatment method of road |
| CN103899351A (en) * | 2014-03-28 | 2014-07-02 | 中冶沈勘工程技术有限公司 | Filling and reinforcing method for processing complicated goafs |
| CN105422170A (en) * | 2015-11-02 | 2016-03-23 | 安徽理工大学 | Grouting reinforcement treatment method for mid-depth goaf below building foundation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108240234A (en) | 2018-07-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108240234B (en) | A kind of Along Railway underlies coal mine gob Grouting method | |
| CN108999634B (en) | Surface drilling realizes that a hole of water damage prevention and treatment and surface settlement control is mostly used method | |
| CN100591866C (en) | Drifting sand layer and gravel stratum water-moving double-liquid high pressure slip-casting water-blocking construction method | |
| CN105422170B (en) | Middle deep goaf grouting reinforcing and processing method under a kind of building foundation | |
| CN105201448B (en) | Block water slip casting method for blocking in a kind of high-pressure high-flow water gushing channelway | |
| CN105804761B (en) | Construction method suitable for liquefied sand stratum shield near-distance passing through building | |
| CN103334770B (en) | One is grown up reverse-slope tunnel ultra high water pressure rich water zone of fracture construction method | |
| CN103628912B (en) | The construction method of filling grouting is processed in a kind of goaf | |
| CN110359921A (en) | Wear the construction method of building in a kind of shield short distance side | |
| CN110924967B (en) | Fine control construction method for shield proximity sensitive building in water-rich sandy gravel stratum | |
| CN107842374B (en) | The novel inert slurry of shield and combination grouting process for upper soft lower hard water rich strata | |
| CN103291325A (en) | Method for preventing and controlling water burst of coal mining base board rock stratum on pressure bearing water body | |
| CN105155563A (en) | Reinforcing and treating method for water burst of soft-flow muddy stratum of foundation pit | |
| CN110863833B (en) | Tunneling parameter control process of tunnel shield tunneling starting end boulder area shield tunneling machine | |
| CN106979012A (en) | Hidden conduit pipe Comprehensive Treatment method in shaft of vertical well freezing hole | |
| CN102337732A (en) | Seawall construction method with top pipes penetrating through block stone | |
| CN105484269A (en) | Leakage prevention construction method of foundation pit support structure under blasting condition | |
| CN110469332A (en) | A kind of advance support consolidation method passing through Debris Flow Deposition body tunnel | |
| CN102011591A (en) | Grouting process for working surface of deep well | |
| Zhang et al. | Experimental investigation of the pressure and water pressure responses of an inclined shaft wall during grouting | |
| CN112610249A (en) | Method for preventing and controlling water damage of mine bottom plate under high-pressure-bearing flowing water condition | |
| CN108825263B (en) | It is a kind of from appearing to the curtain-grouting method in real coal body section part burnt rock water-bearing layer | |
| CN110439011A (en) | A kind of side slope antiskid supporting construction and its construction method | |
| Ischy et al. | AN INTRODUCTION TO ALLUVIAL GROUTING. | |
| CN109024621A (en) | The compound retaining wall supporting construction of embankment high slope tubular pole and its construction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |